Datasheet

Figure 38-4. Crystal Oscillator Connection
C
SH UNT
L
M
R
M
C
M
C
ST RAY
C
LE XT
C
LE XT
Xin
Crystal
Xout
38.8.2 External 32 kHz Crystal Oscillator (XOSC32K) Characteristics
38.8.2.1 Digital Clock Characteristics
The following table describes the characteristics for the oscillator when a digital clock is applied on XIN32
pin.
Table 38-23. Digital Clock Characteristics
Symbol Parameter Conditions Min. Typ. Max. Units
f
CPXIN32
XIN32 clock frequency - 32.768 - kHz
XIN32 clock duty cycle - 50 - %
38.8.2.2 Crystal Oscillator Characteristics
Figure 38-4 and the equation in 38.8.1.2 Crystal Oscillator Characteristics also applies to the 32 kHz
oscillator connection. The user must choose a crystal oscillator where the crystal load capacitance C
L
is
within the range given in the table. The exact value of C
L
can be found in the crystal datasheet.
Table 38-24. 32kHz Crystal Oscillator Characteristics
Symbol Parameter Conditions Min. Typ. Max. Units
f
OUT
Crystal oscillator frequency I - 32768 - Hz
t
STARTUP
Startup time ESR
XTAL
= 39.9 kΩ, C
L
=
12.5 pF
- 28K 30K cycles
C
L
Crystal load capacitance I - - 12.5 pF
C
SHUNT
Crystal shunt capacitance I - 0.1 -
C
XIN32
Parasitic capacitor load - 3.2 -
C
XOUT32
Parasitic capacitor load - 3.7 -
SAM D21 Family
Electrical Characteristics at 105°C
© 2018 Microchip Technology Inc.
Datasheet Complete
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